Wichat Promrat. (1999) A study of the numeral classifiers in present standard Khmer. Mahidol University,:ม.ป.ท.Wichat Promrat. 1999. A study of the numeral classifiers in present standard Khmer. ม.ป.ท.:Mahidol University,;Wichat Promrat. A study of the numeral classifiers in present standard Khmer. ม.ป.ท.:Mahidol University, 1999. Print.